Pump



Jan. 11, 1966 M. L. HUBBARD PUMP Filed Aug. 3.3, 1962 3 Sheets-Sheet l 2. FIG. 1% FIG 12 /0 lg z5 /4 34 2; 4 34 3 36 3% 1 36 32 U\ 2 30 15/ 4 52. J 1i 2 .1 40 46 4 Z2 Z4 44 5 Z2 Z4 3 z V 4 0 3 g /@|L m f I; @L if 1m. H mm. 3 J.HH1-. I llllmi. i

w 26 52 P1 52 zomLl INVENTOR.

MEL w/v L. HUBBARD 5y /-//5 ATTORNEY HARRIS, K/EcH, RUSSELL 6: KERN Jan. 11, 1966 M. 1.. HUBBARD PUMP 3 Sheets-Sheet 2 Filed Aug. 13, 1962 FIG. 6.

FIG. 5.

INVENTOR. MEL w/v L. HUBBARD BY H/S ATTORNEYS HARE/S, K/Ecw, RUSSELL 6c KER/v Jan. 11, 1966 M. HUBBARD PUMP 3 Sheets-Sheet 5 Filed Aug. 13, 1962 FIG. .9. .FIa. 10.

FIG. 14.

INVENTOR. MEL w/v L. HUBBARD BY 11/5 ATTORNEYS HARE/5, K /EcH, RUSSELL & KERN United States Patent 3,228,340 PUMP Melvin L. Hubbard, Dana Point, Calif, assignor to Southwestern Research and Development Company, Dana Ioint, Calii'., a limited partnership of California Filed Aug. 13, 1962, Ser. No. 216,517 21 Claims. (Cl. 10376) This invention relates to pumps and, more particularly, to a pump suitable for the conveying of free-flowing solids or slurries having a very low liquid content such as concrete, sludge and the like. In one form, the pump of the invention is especially adapted to handle liquids.

Pumps for the movement of free flowing solids and low liquid content materials such as concrete are particularly susceptible to abrasion and wear. It is especially desirable in a solids pump to have the minimum of moving parts. It will be appreciated that valves and pistons of a standard type reciprocating pump used for the transfer of free-flowing solids will in a short time exhibit excessive wear.

It is, therefore, a primary object of the invention to provide a pump having a minimum of moving parts.

It is a still further object of the invention to provide a pump employing centrifugal forces to effect displacement of the material being transferred.

It is another object of the invention to provide a pump having a tubular pumping member with an inlet at its upper end and a laterally-opening outlet at its lower end, the tubular pumping member being pivotally supported adjacent its upper end and means being provided for imparting a rocking motion to the pumping member about the pivot support.

It is a still further object of the invention to provide a pump for the transfer of solids which pump requires a minimum of maintenance.

A still further object is to provide a pump of a simplified and rugged design especially suitable for the transfer of free-flowing solids and high solid content slurries such as concrete and the like.

The improved pump of the invention includes a tubular pumping member provided with an inlet arm and an outlet arm with the inlet arm being pivotally supported. Means are provided for imparting a rocking or back-andforth motion to the pumping member about the pivot support of the inlet arm. The tubular pumping member preferably has an acute angle at the intersection between the inlet and outlet arms, but the acute angle is not mandatory for operation.

Where the device is being used for the pumping of free-flowing solids or high solid content slurries, the tubular pumping member has an open passage extending its length and free of obstruction, there being no valve or pistons disposed therein. When the device is being used for the pumping of liquids, it is desirable that a one-way valve be positioned in the opening passage of the tubular pumping member to permit flow in the direction of the outlet arm and to forestall flow in the reverse direction.

The pump of the invention employs centrifugal forces and inertia to displace the material being transferred. The centrifugal forces are obtained by imparting a limited rocking motion to the tubular pumping member about the pivot support of the inlet arm. It will be appreciated that with variations in pump radius, length of stroke and frequency, the pressure generated by the pump will vary considerably.

Other objects and advantages will appear from the following specification and drawings in which:

FIGS. 16 are a sequence of front elevational views, partially cut away, illustrating succeeding positions during the operation of a preferred embodiment of the pump of the invention;

3,2283% Patented Jan. 11, 1966 FIG. 7, is a sectional view, partly in elevational, of the pump of the invention with a one-way valve moved into operative position to adapt the pump to transfer liquids;

FIG. 8 is an elevational view, partially cut away, of the pump of the invention situated in a somewhat different position than the pump of FIGS. 1-7;

FIG. 9 is a cross-sectional view along line 9-9 of FIG. 7 through an upper portion of the tubular pumping member of the pump of that figure;

FIG. 10 is a cross-sectional view along line 1010 of FIG. 7 of a lower portion of the inlet arm of the tubular pumping member;

FIG. 11 is a cross-sectional view along line 1111 of FIG. 7 of the outlet arm of the tubular pumping member;

FIG. 12 is a sectional view taken along line 12-12 of FIG. 7 illustrating in greater detail the structure of the one-way valve;

FIG. 13 is a cross-sectional View taken along line 13 13 of FIG. 12;

FIG. 14 is an overhead view of two pumps of the invention connected in parallel to a common conduit with upper portions of the two pumps being removed for illustration purposes;

FIG. 15 is a sectional view taken along line 1S15 of FIG. 14; and

FIG. 16 is a modified form of an adapter coupling connecting the outlet of the tubular pump member of the invention to a fixed conduit.

The preferred embodiment of the rocker lift pump 19 of the invention is illustrated in the sequence of FIGS. 1-6. The pump 10 includes a tubular pumping member 12 connected at its upper end through a flexible rubber adapter coupling 14 to the outlet of a bin 16. The tubular pumping member 12 includes an inlet arm 18, the upper end of which is connected to the adapter coupling 14, and an outlet arm 20. In the particular embodiment illustrated, the lower portion of the inlet arm 18 is set at an acute angle to the outlet arm 20. The outlet arm 20 is flexibly connected through a heavy rubber adapter coupling 22 to a fixed conduit 24. The adapter coupling 22 is enclosed in a heavy metal sheath 26 which guards against excessive ballooning of the rubber adapter coupling under the high operating pressures. The sheath 26 is fixed at one end to the conduit 24, being free at its other end. The adapter couplings 14 and 22 may be held to their associated parts by riveting, vulcanizing or other suitable bonding techniques and are desirably multiple-ply and cordreinforced to provide the strength required for long use.

The tubular pumping member 12, or, more exactly speaking, its inlet arm 18, is pivotally supported by a pump frame 28. A heavy metal band 30 encircling the upper end of the inlet arm 18 is provided with two integrally-formed, upwardly-extending, spaced hangers 32. The hangers 32, which are on opposite sides of the inlet arm 18, are respectively supported by stub shafts 34 in bearing blocks 36. The bearing blocks 36 are respectively supported by spaced, transverse, horizontally-disposed braces 38 of the pump frame 28.

The means for imparting a rocking motion to the tubular pumping member 12 about the pivot support of the inlet arm 18 includes a motor 40 which is connected through an eccentric 42 and connecting rod 44 to the end of the inlet arm 18. The connecting rod 44 is pivotally mounted at its opposite ends. With rotation of the shaft of the motor 40 in either direction the eccentric 42 will rapidly move the tubular pumping member back and forth. The eccentric 42 is counterbalanced by a weight 43 to minimize vibrations.

The operation of the pump is best understood by studying the sequence presented in FIGS. 16. The fol lowing discussion of forces acting within the pump are based on present understanding and are offered as a possible explanation of the operation of the pump. The two extreme positions of the tubular pumping member are illustrated in FIGS. 1 and 2 respectively. In FIG. 1 the pump is in position A and may be viewed either as being at the end of its intake or loading stroke or at the beginning of its pressure stroke. The pump 10 in its position C of FIG. 2 may be viewed either as at the end of its pressure stroke or at the beginning of its intake or loading stroke. In FIGS. 3 and 5 the pump is in its intermediate position B and, more exactly speaking, the pump in FIG. 3 is approximately halfway through its loading stroke and in FIG. 5 approximately halfway through its pressure stroke.

The tubular pumping member 12 of the pump is shown filled with a free-flowing solid material and for ease of description there are illustrated in FIGS. 1-6 several portions of material numbered 1 through 5. It is important to note that with the pressure swing or stroke from position A to position C, as illustrated in FIGS. 1 and 2, there is no movement of the material relative to the tubular pumping member 12. The pumping member 12 and material contained therein are merely carried to position C. When the tubular pumping member has reached position C, it is abruptly reversed through the eccentric action and the material in the outlet arm 20 of the tubular pump member 12 proceeds in a trajectory course towards the stationary conduit 24. As the tubular pumping member 12 proceeds back towards position A (see FIG. 3 Where it now occupies position B) a void is momentarily created in the general area defined by the intersection of the two arms .18 and 20 which void is rapidly filled with additional material of portion 3. The void is primarily filled under the high gravity or centrifugal forces generated by the pump, although a partial vacuum does assist to some extent.

The pump in FIG. 4 is once again in its position A and is at the end of its intake or loading stroke. Alternatively, the position A of FIG. 4 may be viewed as the beginning of the pressure stroke. The material of portions 2 and 3 with movement of the pump away from position A into its pressure stroke serves as a piston, pushing the material of portion 1 which is principally within the coupling 22 toward the conduit 24. In the event the pump is operating against a low head and with high strokes per minute, the material of portion 1 may not, strictly speaking, be solely pushed but could under the influence of inertia be proceeding forward out of reach of the material in the outlet arm 20.

In FIG. 6 the pump has reversed its direction and is in the beginning of its loading swing. When the pump reverses its direction at position C, the gravity or centrifugal forces that had formerly frictionally held the material against the bottom wall of the outlet arm 20 are released, allowing the contents of the outlet arm 20 to proceed in its straight trajectory course. It is important to the efiicient operation of the pump that the trajectory course of the released material be substantially along the axis of the fixed conduit 24, this being achieved by 10- cating the outlet arm 20 in position C in alignment with the conduit 24. The tubular pumping member 12 may be viewed as a pendulum and, for the most efiicient operation, the pumping member must reverse its course at the bottom center of its pendulum swing with the pump 10 and conduit 24 located as in FIGS. 1-6. The efliciency of the pump is improved by making the outlet arm 20 as short as possible. With a pump of a relatively long stroke, the outlet arm may be curved slightly to maintain a constant dimension along its center line to the pivot support of the tubular pumping member 12. The inlet end of the fixed conduit 24 is accordingly curved to permit accurate alignment of the outlet arm 20 and conduit.

The configuration of the tubular pumping member 12 has an important bearing on the efficiency of the pump of the invention. The inner end of the outlet arm 20 is backed by a sloping rear wall 46 which also forms the juncture end of the inlet arm 18. In the particular embodiment illustrated, the wall 46 has approximately a 45 angle to the outlet arm 20. The pump will operate satisfactorily with the wall 46 placed at various acute angles up to a right angle to the outlet arm 20. The pump becomes ineflicient to a great degree if the wall 46 is made obtuse. In the pumping of free-flowing solids or concrete of a low liquid content, the surface 46 serves, in effect, as a valve during the forward swinging of the tubular pumping member in its pressure stroke.

During the pressure stroke, the weight of the material in the bin 16 and inlet arm 18, or, more strictly speaking, the high centrifugal forces generated through swinging of the pumping member 12 and the surface 46 both assist in resisting the tendency of the material within the outlet arm 20 to return to the upper portion of the pump.

In this regard, it has been found that concrete acts more as a solid rather than liquid with the result that pressures applied to the concrete within the outlet arm 20 do not register equally in all directions as is characteristic of a liquid. Hence, the lines of force developed in the concerete being pumped are more similar to the lines of force characteristic of a free-flowing solid, and, as a result, the forces are directed in one direction because of the valving surface 46. The efiectiveness of the valving action of surface 46 is dependent, among other things, on the liquid content of the material being pumped, and the angle at which the valving surface 46 is placed. The magnitude of the gravity or centrifugal forces developed is most important to the valving of the material being pumped. The greater the liquid content of the material, the more dependent the pump is upon the development of high G or high centrifugal forces. For the pumping of liquid, it is necessary that standard valving be used if high pumping efiiciencies are required.

The pump of FIGS. 1-6 is provided with a retractable one-way flapper-type valve 48 which may be moved in and out of the open passage of the tubular pumping member 12. It should be noted that in the pumping of solids and solids with low liquid content the tubular pumping member has an open passage throughout its length free of obstruction. This feature minimizes wear. The fact that the material being pumped only moves within the pump under a partial vacuum during its loading stroke, also minimizes wear.

The retractable valve 48 is a conventional flapper-type valve having a flexible rubber diaphragm 50 (FIGS. 12 and 13) which permits passage of water or other liquid towards the outlet arm 20 and forestalls movement of liquid in the reverse direction. A cone member 52 precludes complete collapsing of the diaphragm 50 With the application of force to its upper side. The provision of a retractable valve is an especially desirable feature in a pump used for pumping concrete as its presence facilitates the cleaning of the pump.

It has been found that the valving action of the pump can be improved without decreasing its pumping capacity by making the lower portion of the inlet arm 18 elliptical in cross section as shown in FIG. 10. The cross sections of the upper inlet and outlet arms 18 and 20 of the embodiment illustrated are round, see FIGS. 9 and 11.

The pump of the invention is desirably used in pairs with the two pumps of a pair being connected in parallel and joined through a Y connection to a common conduit. The two pumps are operated out of cycle and with this arrangement there is a substantially constant pressure being applied to the material Within the conduit. Such an arrangement is illustrated in FIG. 14 where it is seen that pumps 60 and 62 (with their upper portions and bins removed for illustration purposes) are driven by eccentrics carried at the opposite ends of a drive shaft 63 of a motor 64. The two pumps 60 and 62 are respectively provided with one-way valves 66 and 68. Pressure lines 70 and 72 from the two pumps join to form a conduit 74. A cross section of the valve 68 is provided in FIG. where it is seen to have a hinged gate 71 which opens to permit the passage of liquid towards the conduit 74 and which is closed to liquid flow in the reverse direction.

It has been found that the efiiciency of the pump of the invention may be enhanced by providing a means 89 for slowing outward movement of the tubular pumping member 12 immediately preceding its reversal of direction. This is achieved by fixing a check member 82 to the underside of the outward outlet arm 20, which check member is positioned to engage a bumper member 84 immediately preceding the reversal of direction of the outlet arm. The bumper member 84 in the embodiment illustrated comprises a freely rotating rubber wheel with its axis so set that with each striking or bumping, the wheel is slowly rotated. The rubber wheel is desirably a gas inflated tire.

The adapter coupling 22 between the outlet arm and the fixed conduit 24 may take various forms. One suitable form is an accordion type. The rubber coupling 22 is riveted at its opposite ends or otherwise suitably fixed, as by metal bands, to the outlet arm 20 and the fixed conduit 24. To guard against ballooning of the adapter coupling 22 it is enclosed in the metal sheath 26. Still another form of an adapter coupling is illustrated in FIG. 16. Coupling 86 of FIG. 16 flexes in a fashion similar to the beginning of the turning inside out of a flexible rubber hose. During the pressure stroke, a smaller diameter portion of the rubber coupling 86 rolls inside a larger diameter stationary portion as the outlet arm 20 of the tubular pumping member 12 moves forward into the larger stationary conduit 24. During the loading stroke, the adapter coupling 86 rolls outward toward its original position. The adapter couplings are reinforced with nylon, steel or the other types of cord to the required plies necessary for the anticipated pressure likely to be attained during the operation of the pump. The cords within the plies are desirably woven to provide maximum strength and flexibility. Other forms of adapter couplings may be employed. In one preferred form, the coupling of FIG. 16 comprises four rubber plies with each layer being reinforced with nylon cord and with the cord of alternate layers being placed crosswise of the adjacent layer.

The connecting rod 44 of the drive mechanism of the pump may be provided with a release mechanism of a conventional type set at any desired pressure to protect the pump against pressures greater than its setting.

In the operation of the pump of the invention to elevate a load above the level of the pump, it has been found that large frictional losses will occur in a sharp upward curve of the conduit 24 beyond the pump. It is possible with the pump of the invention to place it in various positions, as illustrated in FIG. 8, to avoid sharp bends of the conduit 24 and thus minimize the frictional losses. The pump of FIG. 8 differs in some slight respects from the pump of FIGS. 1-7. The pump has been rotated about its pivotal axis to place the axis of the outlet arm 29 of the tubular pumping member 12 approximately to the horizon. The motor 49 and its stand have been moved inwardly under the bin 16 in order to use the same length connecting rod 44. The configuration of the upper portion of the inlet arm 13 of the tubular pumping member 12 has been modified to some degree to facilitate operation of the pump in its angled position without altering the bin 16 and the pump frame 28. The rear side of the inlet arm 18 has been lengthened considerably. Additional framework including supports 88 and 96 is provided to hold the pump 10 and conduit 24 in the position of FIG. 8. The pump of FIGS. 1-7 may be placed in the angled position of FIG. 8 without altering the configuration of the outlet arm 26 by using a modified adapter coupling 14 between the arm and bin 16.

Although exemplary embodiments of the invention have been disclosed herein for purposes of illustration, it will be understood that various changes, modifications, and substitutions maybe incorporated in such embodiments without departing from the spirit of the invention as defined by the claims which follow.

1. A pump comprising:

a tubular pumping member having an inlet at its upper end and a laterally-opening outlet at its lower end, said tubular pumping member being pivotally supported adjacent its upper end to permit pendulumlike movement of its lower end;

means for imparting a rocking motion to the tubular pumping member about the pivot support; and

means for movably connecting the tubular pumping member through its laterally-opening outlet to a transfer conduit.

2. A pump comprising:

a tubular pumping member having an inlet arm having an inlet at its upper end and an outlet at its lower end and a laterally-opening outlet arm with the outlet of the inlet arm opening into the outlet arm, said inlet arm being pivotally supported adjacent its upper end to permit pendulum-like movement of the outlet arm;

means for imparting a rocking motion to the pumping member about the pivot support of the inlet arm; and

means for 'movably connecting the outlet arm to a transfer conduit.

3. A pump comprising:

a tubular pumping member having a generally vertically disposed inlet arm having an inlet adjacent its upper end and a laterally-opening outlet arm with the lower end of the inlet arm opening into the outlet arm and with an acute angle at the intersection therebetween and with the inlet arm being pivotally supported about a single axis adjacent its upper end to permit pendulum-like movement of the outlet arm, said tubular pumping member having an open passage therethrough; and

means for moving the tubular pumping member back and forth about the pivot support of the inlet arm.

4. A pump comprising:

a tubular pumping member having an inlet arm and a laterally opening outlet arm with an accute angle at the intersection therebetween and with the inlet arm being pivotally supported about a single axis, said tubular pumping member having an open passage therethrough;

means for moving the tubular pumping member back and forth about the pivot support of the inlet arm; and

means for slowing outward movement of the outlet arm immediately preceding its reversal of direction.

5. A pump for moving material through a transfer conduit; said pump comprising:

a reservoir with an outlet;

a tubular pumping member having an inlet arm and a laterally-opening outlet arm with the inlet arm being pivotally supported about a single axis and with its upper end being flexibly connected to the reservoir outlet and with the outlet arm being flexibly connected to the transfer conduit, said tubular pumping member having an open passage therethrough; and

means for imparting a limited rocking motion to the outlet arm about the pivot support of the .inlet arm.

6. A pump in accordance with claim 5 wherein there is provided a one-way valve movable into the open passage of the tubular pumping member, said valve when located in the passage permitting flow in the direction of the outlet arm and transfer conduit and forestalling flow in the reverse direction.

7. A pump in accordance with claim wherein there is provided means for slowing outward movement of the outlet arm immediately preceding its reversal of direction.

8. A pump comprising:

a tubular pumping member having a laterally-opening outlet arm and a generally vertically disposed inlet arm having an inlet at its upper end and with the inlet arm being pivotally supported adjacent its upper end to permit pendulum-like movement of the outlet arm, said tubular member having a one-way valve permitting flow in the direction of the outlet arm and forestalling flow in the reverse direction;

means for imparting a rocking motion to the outlet arm about the pivot support of the inlet arm; and

means for fiexibly connecting the outlet arm of the tubular pumping member to a conduit.

9. A pump comprising:

a framework;

a tubular pumping member having an inlet arm and a laterally-opening outlet arm with the inlet arm being pivotally supported by the framework about a single axis;

means for imparting a limited rocking motion to the outlet arm about the pivot support of the inlet arm; and

means for slowing outward movement of the outlet arm .immediately preceding its reversal of direction.

10. A pump in accordance with claim 9 wherein the means for slowing outward movement of the outlet arm comprises a flexible stop member fixed to the framework, and an engaging member fixed to the outlet arm and adapted to engage the stop member with outward swinging of the outlet arm.

11. A pump comprising:

a tubular pumping member having an inlet arm having an inlet at its upper end and a laterally-opening outlet arm communicating with the lower end of the inlet arm and with the inlet arm being pivotally supported adjacent its upper end about a single axis to permit pendulum-like movement of the lower disposed outlet arm, said tubular pumping member having an open passage therethrough; and

means for moving the tubular pumping member back and forth about the pivot support of the inlet arm.

12. A pump suitable for the movement of slurries through a conduit, said pump comprising:

a tubular pumping member having a generally vertically disposed inlet arm having an inlet at its upper end and a laterally-opening outlet arm communicating with the lower end of the inlet arm and with the inlet arm being pivotally supported adjacent its upper end to permit pendulum-like movement of the outlet arm, said tubular pumping member having an open passage therethrough;

means for flexibly coupling the outlet arm of the tubular pumping member to the conduit; and

means for imparting a rocking motion to the pump member about the pivot support of the inlet arm.

13. A pump suitable for transferring a slurry-like material from a hopper through a conduit, said pump comprising:

a tubular pumping member having an inlet arm and a laterally-opening outlet arm with the inlet arm being pivotally supported adjacent to its upper end, said tubular pumping member having an open passage therethrough;

means for movably connecting the upper end of the inlet arm of the tubular pumping member to the hopper;

means for movably connecting the laterally-opening outlet arm to the conduit; and

means for imparting a rocking motion to the pump member about the pivot support of the inlet arm.

14. A pump comprising:

a tubular pumping member having a generally verti- 8 cally disposed inlet arm having an inlet at its upper end and a laterally-opening outlet arm opening into the lower end of said inlet arm and with the inlet arm being pivotally supported about a single axis adjacent its upperend to permit pendulum-like movement thereof; and

means for imparting a rocking motion to the tubular pumping member about the pivot support of the inlet arm.

15. A pump comprising:

A tubular pumping member having a generally vertical inlet arm having an inlet at its upper end and a laterally-opening outlet arm communicating with the lower end of said inlet arm with the inlet arm being pivotally supported adjacent its upper end about a single axis to permit pendulum-like movement of the outlet arm, said tubular member having a one-way valve permitting flow in the direction of the outlet arm and forestalling fiow in the reverse direction;

means for imparting a rocking motion to the outlet arm about the pivot support of the inlet arm; and

means for movably connecting the outlet arm to a conduit.

16. A pumping installation comprising:

a conduit;

two pumps connected in parallel through two arms of a Y-connection to said conduit;

each of said pumps including a tubular pumping member having an inlet arm and a laterally-opening outlet arm with the inlet arm being pivotally supported adjacent its upper end, said tubular pumping member having an opening therethrough;

means for movably connecting the outlet arms of the two pumps to their respective arms of the Y-connection; and

means for imparting rocking motion to the pumping members of the two pumps about the pivot supports of their respective inlet arms, said means being arranged to place one of the pumps in its intake stroke while the other pump is in its pressure stroke.

17. A pump comprising:

a generally vertically disposed tubular pumping member open at its upper end to provide an inlet and closed at its lower end and having a laterally-opening outlet adjacent said lower end with an open passage connecting the inlet and outlet, said tubular pumping member being pivotally supported about a single axis adjacent said upper end to permit pendulum-like movement about said axis;

means for movably connecting the tubular pumping member through the laterally-opening outlet to a conduit; and

means for imparting a limited rocking motion to the tubular pumping member about its axis.

18. A pump comprising:

a tubular pumping member having a generally vertically disposed inlet arm with an inlet at its upper end and a laterally-opening outlet arm communicating with the lower end of said inlet arm and with the inlet arm being pivotally supported about its upper end on a single axis, said tubular pumping member having a passage therethrough with a valve disposed within said passage; and

means for moving the tubular pumping member back and forth about the pivot support of the inlet arm.

19. A pump comprising:

a tubular pumping member having an inlet arm and a laterally-opening outlet arm with the inlet arm being pivotally supported about a single axis, said tubular pumping member having a passage therethrough with a valve disposed within said passage, said valve comprising a valving surface set at an angle within the passage of the tubular pumping member and only partially closing said passage; and

means for moving the tubular pumping member back and forth about the pivot support of the inlet arm.

29. A pump comprising:

tubular pumping member open at its upper end to provide an inlet and closed at its lower end and having a laterally-opening outlet adjacent said lower a valve within said passage, said valve comprising a valving surface set at an angle Within the passage and only partially closing said passage;

means for movably connecting the tubular pumping 5 member throu h the lateral] -o enin outlet to a end with a passage connectlng the inlet and outlet, yconduit. and g y p g 531d tubular pumping 1 being rfwotany supmeans for imparting a limited rocking motion to the ported about a slngle axis ad acent said upper end tubular] um in member about its axis to permit pendulum-like movement about said axis; p p g a valve disposed within said passage; 10 means for movably connecting the tubular pumping Reeremes cued by the Exammer member through the laterally-opening outlet to a UNITED STATES PATENTS conduit; and means for imparting a limited rocking motion to the 260,921 7/1882 Alpqche 103-76 X tubular pumping member about its axis, 15 991,708 5/ 1911 Fastlng 1 -7 21. A pump comprising: 2,957,577 10/1960 COHHEHY 209-490 X a tubular pumping member open at one end to provide 3,136,257 6/1964 Smith fit 10376 X an inlet and closed at its other end and having a laterally-opening outlet adjacent said other end With a passage connecting the inlet and outlet, said tubular pumping member being pivotally supported about a single axis adjacent said one end to permit pendulum-like movement about said axis;

DONLEY J. STOCKING, Primary Examiner.

20 LAURENCE v. EFNER, WARREN E. COLEMAN,

Examiners. 

1. A PUMP COMPRISING: A TUBULAR PUMPING MEMBER HAVING AN INLET AT ITS UPPER END AND A LATERALLY-OPENING OUTLET AT ITS LOWER END, SAID TUBULAR PUMPING MEMBER BEING PIVOTALLY SUPPORTED ADJACENT ITS UPPER END TO PERMIT PENDULUMLIKE MOVEMENT OF ITS LOWER END; MEANS FOR IMPARTING A ROCKING MOTION TO THE TUBULAR PUMPING MEMBER ABOUT THE PIVOT SUPPORT; AND MEANS FOR MOVABLY CONNECTING THE TUBULAR PUMPING MEMBER THROUGH ITS LATERALLY-OPENING OUTLET TO A TRANSFER CONDUIT. 